The killer whale population in the Puget Sound in Washington state has been dropping quickly, worrying environmentalists. Only about 78 orcas now live in the sound, a level not seen since 1985, and the social pods they live in are splintering.(Photo : Robert Pittman | NOAA )

The killer whale population in the Puget Sound in Washington state has been dropping quickly, worrying environmentalists. Only about 78 orcas now live in the sound, a level not seen since 1985, and the social pods they live in are splintering.